单选题Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.Aoperated manually once an hourBoperated until the engine has startedCplaced into operation only at maximum loadDadjustable to meet lubrication requirements
单选题
Mechanical lubricators for diesel engine cylinders are usually small reciprocating pumps which are （）.
A
operated manually once an hour
B
operated until the engine has started
C
placed into operation only at maximum load
D
adjustable to meet lubrication requirements
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